Glueless shoe sole assembly

ABSTRACT

A glueless shoe sole assembly includes an outsole and a midsole. The outsole includes an accommodation cavity, an endless internal mounting groove extending around the accommodation cavity and an endless external mounting groove extending around the outer periphery thereof the outsole for the mounting and fixation of a contact part of an upper. The midsole includes a bottom wall detachably accommodated in the accommodation cavity of the outsole and an endless mounting portion extending around the bottom wall and detachably press-fitted into the endless internal mounting groove of the outsole to secure the midsole to the outsole tightly.

BACKGROUND OF THE INVENTION (a) Field of the Invention

The present invention relates to shoe technology and more particularly to a glueless shoe sole assembly, which facilitates mounting and dismounting between an outsole and a midsole without using any glue.

(b) Description of the Prior Art

The sole structure of a shoe is mainly composed of an outsole and a midsole. The outsole and the midsole of a shoe sole are commonly fastened together by bonding or stitching. The process of fastening an outsole and a midsole by bonding needs to use a large amount of glue. Industrial glue has a direct health hazard to shoe manufacturing workers, and can cause damage to the environment. This bonding technique has been inconsistent with today's environmental protection requirements. With respect to stitching techniques, China Patent No. CN2268408Y discloses a stitch hole-based upper and sole mounting design. According to this design, it is necessary to make stitch holes on the outsole before mounting, so it is prone to develop water seepage problems. Further, because the midsole and the upper are directly stitched together to the outsole, disassembly and cleaning are very inconvenient. Further, Taiwan Patent No. M512936 discloses a glueless sole structure design. According to this design, a thin film having thermal shrinkage and melting characteristics is set in between a midsole and an outsole and then heated to wrap about the midsole and to bond the outsole and the midsole together. Although this technique eliminates a tackiness process, the use of a film having thermal shrinkage and melting characteristics needs a heat treatment, thereby increasing the manufacturing process.

SUMMARY OF THE INVENTION

The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a glueless shoe sole assembly, which comprises an outsole and a midsole. The outsole comprises an accommodation cavity adapted for accommodating the midsole, and an endless internal mounting groove extending around the accommodation cavity. The midsole comprises a bottom wall detachably inserted into the accommodation cavity of the outsole, and an endless mounting portion extending around the bottom wall and detachably press-fitted into the endless internal mounting groove of the outsole to secure the midsole to the outsole tightly. Thus, the outsole and the midsole can be fastened together easily and rapidly without using any glue.

According to another aspect of the present invention, the outsole is a dual layer member comprising an upper layer and a bottom layer joined together. The upper layer and the bottom layer may be made of different materials. The outsole further comprises an endless external mounting groove extending around the periphery thereof for the mounting and fixation of a contact part of an upper. Thus, the outsole and the upper can be fastened together easily and rapidly without using any glue or creating stitching holes, thus preventing water seepage.

According to another aspect of the present invention, the endless internal mounting groove of the outsole and the endless mounting portion of the midsole are configured to match to each other. Preferably, the endless internal mounting groove of the outsole is a beveled groove; the endless mounting portion of the midsole is a beveled flange fitting the beveled shape of the endless internal mounting groove of the outsole.

Other advantages and features of the present invention will be fully understood by reference to the following specification in conjunction with the accompanying drawings, in which like reference signs denote like components of structure.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of a glueless shoe sole assembly in accordance with the present invention.

FIG. 2 is a bottom view of the outsole of the glueless shoe sole assembly in accordance with the present invention.

FIG. 3 is a side view of the outsole of the glueless shoe sole assembly in accordance with the present invention.

FIG. 4 is a sectional view taken along line A-A of FIG. 2.

FIG. 5 is a top view of the outsole of the glueless shoe sole assembly in accordance with the present invention.

FIG. 6 is a schematic sectional exploded view of the glueless shoe sole assembly in accordance with the present invention.

FIG. 7 is a sectional view taken along line B-B of FIG. 5.

FIG. 8 is a schematic drawing illustrating the outer appearance of a shoe using the glueless shoe sole assembly in accordance with the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Referring to the annexed drawings in detail, a glueless shoe sole assembly in accordance with the present invention is shown. The glueless shoe sole assembly 10 comprises an outsole 1 and a midsole 2 (see FIG. 1).

The outsole 1, as illustrated in FIGS. 2-5, comprises an accommodation cavity 11, and an endless internal mounting groove 12 extending around the accommodation cavity 11. The material of the outsole 1 can be, but not limited to, natural or synthetic leather.

The midsole 2, as illustrated in FIG. 6, comprises a bottom wall 21, an endless mounting portion 22 extending around the bottom wall 21. The endless mounting portion 22 can be press-fitted into the endless internal mounting groove 12 of the outsole 1 to tightly secure the midsole 2 to the inside of the accommodation cavity 11 of the outsole 1, facilitating mounting and dismounting without using any glue.

As illustrated in FIG. 4 and FIGS. 6-7, the outsole 1 is a dual layer member comprising an upper layer 1 a and a bottom layer 1 b joined together. In this embodiment, the accommodation cavity 11 is formed on the upper side of the upper layer 1. The outsole 1 further comprises an endless external mounting groove 13 extending around the outer periphery thereof for the mounting and fixation of a contact part of an upper 3. Thus, the outsole 1 and the upper 3 can be fastened together easily and rapidly without using any glue or creating stitching holes, thus preventing water seepage.

The endless internal mounting groove 12 of the outsole 1 and the endless mounting portion 22 of the bottom wall 21 of the midsole 2 are configured to match to each other. Further, the endless internal mounting groove 12 and the endless mounting portion 22 are respectively configured to provide a respective beveled mating surface 121 or 221 (see FIG. 6). By means of mating design between the beveled mating surface 121 of the endless internal mounting groove 12 and the beveled mating surface 221 of the endless mounting portion 22, the outsole 1 and the midsole 2 can be quickly and accurately guided into engagement with each other, facilitating quick mounting and dismounting of the midsole 2.

Referring to FIG. 8, the above-described upper 3 refers to the combination of the front, back and lateral surfaces of the shoe. The overall shape or composition of the shoe can be changed according to different requirements without limitation.

Although a particular embodiment of the invention has been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. For example, the endless internal mounting groove 12 of the outsole 1 can be a beveled groove; the endless mounting portion 22 that extends around the bottom wall 21 of the midsole 2 can be a beveled flange fitting the beveled endless internal mounting groove 12 of the outsole 1 for quick mounting. Accordingly, the invention is not to be limited except as by the appended claims. 

What is claimed is:
 1. A glueless shoe sole assembly, comprising an outsole and a midsole, wherein: said outsole comprises an accommodation cavity adapted for accommodating said midsole, and an endless internal mounting groove extending around said accommodation cavity; said midsole comprises a bottom wall detachably inserted into said accommodation cavity of said outsole, and an endless mounting portion extending around said bottom wall and detachably press-fitted into said endless internal mounting groove of said outsole to secure said midsole to said outsole tightly.
 2. The glueless shoe sole assembly as claimed in claim 1, wherein said outsole comprises an upper layer and a bottom layer joined together, and an endless external mounting groove extending around an outer periphery thereof for the mounting and fixation of a contact part of an upper, wherein said accommodation cavity is formed on one side of the upper layer.
 3. The glueless shoe sole assembly as claimed in claim 1, wherein said endless internal mounting groove of said outsole and said endless mounting portion of said midsole are configured to match to each other.
 4. The glueless shoe sole assembly as claimed in claim 1, wherein said endless internal mounting groove of said outsole is a beveled groove; said endless mounting portion of said midsole is a beveled flange fitting said endless internal mounting groove of said outsole. 